ACT unsprung Street Disc

[T9S1i]

The title is right, ACT has an unsprung street disc.

introduction
ACT Releases Its New Line of Solid Hub Street Discs - evolutionm.net

Review by STM on an evo
My review on ACT mb7-hdsd (un sprung street disk) - evolutionm.net

Anybody out there running one?

Ive been looking for a new clutch for the last month or so and ive been back and forth between many different clutches trying to find the right one to fit my car and driving style. Im currently running a 2600 with street disc, and it wont shift for me at high rpms, and when it does its starting to slip now.

So, im looking for a clutch that has everything... slippable, shifts at 8k cleanly, street friendly, and holds power.

I think im going to try this disc out with a 2900 pp, but first i wanted to see if anyone is running it.

Any thoughts or discussion on running this clutch?

 

[Cesar]

I don't think it's a good idea if you intend on driving this on the street as opposed to track. The springs absorb drivetrain shock.

 

[JackM]

I think an unsprung disk is the way to go. Sprung disks are terrible. The sprung section absorbs torsional whip and harmonics from the engine. It may reduce shock a little but not enough to make it worth it IMO. It's an unreliable piece that is not needed, but since so many people feel they have to have it they keep making them.

Your links don't seem to work for me. I'd like to see those as I would like to try a few of them out as well. A street disk that is unsprung sounds like the best setup for the street I have seen yet

Jack

 

[T9S1i]

Thats wierd... the link works for me at work

ACT's new solid hub street discs are designed for the enthusiast looking for the lightest and fastest shifting possible
with an ACT organic disc. Along with smooth and precise engagement like our conventional sprung hub organic discs,
the new lighter solid hub versions offer less stress on synchronizers, steel backed linings for ultra high burst strength
and race proven performance with street manageability.

DESCRIPTION:89-99 MITSUBISHI ECLIPSE TURBO,PART #3000310

DESCRIPTION:89-94 PLYMOUTH LASER TURBO,PART#3000310

DESCRIPTION:91-92 MITSUBISHI GALANT VR4,PART#3000310

DESCRIPTION:92-96 MITSUBISHI LANCER EVOLUTION I, II & III,PART#3000310

DESCRIPTION:03-06 MITSUBISHI LANCER EVOLUTION VIII & IX,PART#3000311

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WARNING: GEAR NOISE MAY OCCUR DUE TO THE ABSENCE OF TORSIONAL DAMPENING SPRINGS



All discs and kits are available now.

 

[snowborder714]

Not necessarily true. I have an account, but could view the page without logging in.

 

[Artago]

Not necessarily true. I have an account, but could view the page without logging in.

You were right, the link works now.

 

[jrohner]

Unsprung would definitely be more reliable. I've broken two, and my cousin with only 320hp/340torque broke one also. Probably one of the weakest parts of the drivetrain is a sprung clutch disc.

 

[T9S1i]

Yeah, ive seriously been going back and forth between too many clutches.

Act 2600 with unsprung 6 puck
Act 2600 with clutchnet sprung 6 puck
Comp clutch stage 4
2900 with street disc
2600 with south bend kevlar disc

It seems like everyone has had good and bad results with every clutch i wanted to go with.
Sprung units pose the risk of popping a spring, and for the most part are heavy and cause lockout
Unsprung are "harsh" and have spline failures
6 puck discs are unfriendly on the street (unslippable) and harsh on the drivetrain
Street discs are heavy and will cause lockout when shifting at high rpms.

After going round and round for the last month, i was finally told about the unsprung street disc by Sean at FFTEC, our local shop/dyno.
I think its probably the best of all worlds for me.
Its light so it will shift at high rpms for me (unsprung)
Its a full face disc so i can slip it a bit driving on the street
And coupled with the 2900 pp, it should hold all the power i throw at it, and be a little easier on my leg (which doesnt matter, ive been driving a 2600 for 5 years or so...)

When looking for a clutch ugrade/replacement, i wanted something that will hold up to 5500 rpm studderbox launches at the track, quick shifts and full disengagement at 8k-8.5k rpm, and be able to hold the power that im going to be putting out with my BW s258 setup (low 11's or maybe a high 10 sec slip at the 1/4 mile track, and 30+ psi of boost)

If anyone else has any better suggestions for what im looking for let me know, but i think im pretty dead set on giving this setup a try.
My friend is building a setup fairly similar to mine, but hes going to be running a stroker motor and a few other newer goodies and hes going with a 2600 and the south bend kevlar disc which is highly reccommended by twicks69, so we can compare the two clutches, and whoever's setup works best then we'll be able to emulate that if necessary.

 

[JackM]

Please let us know how it goes! Looks awesome!

Jack

 

[T9S1i]

Will do!

 

[BoostFrenzy]

Indeed it does. Street friendly disc, lighter rotating mass and better shifts in the high RPMS then with a sprung disc. Me likey .

 

[trick engine]

Yeah, ive seriously been going back and forth between too many clutches.

Act 2600 with unsprung 6 puck
Act 2600 with clutchnet sprung 6 puck
Comp clutch stage 4
2900 with street disc
2600 with south bend kevlar disc

It seems like everyone has had good and bad results with every clutch i wanted to go with.
Sprung units pose the risk of popping a spring, and for the most part are heavy and cause lockout
Unsprung are "harsh" and have spline failures
6 puck discs are unfriendly on the street (unslippable) and harsh on the drivetrain
Street discs are heavy and will cause lockout when shifting at high rpms.

After going round and round for the last month, i was finally told about the unsprung street disc by Sean at FFTEC, our local shop/dyno.
I think its probably the best of all worlds for me.
Its light so it will shift at high rpms for me (unsprung)
Its a full face disc so i can slip it a bit driving on the street
And coupled with the 2900 pp, it should hold all the power i throw at it, and be a little easier on my leg (which doesnt matter, ive been driving a 2600 for 5 years or so...)

When looking for a clutch ugrade/replacement, i wanted something that will hold up to 5500 rpm studderbox launches at the track, quick shifts and full disengagement at 8k-8.5k rpm, and be able to hold the power that im going to be putting out with my BW s258 setup (low 11's or maybe a high 10 sec slip at the 1/4 mile track, and 30+ psi of boost)

If anyone else has any better suggestions for what im looking for let me know, but i think im pretty dead set on giving this setup a try.
My friend is building a setup fairly similar to mine, but hes going to be running a stroker motor and a few other newer goodies and hes going with a 2600 and the south bend kevlar disc which is highly reccommended by twicks69, so we can compare the two clutches, and whoever's setup works best then we'll be able to emulate that if necessary.

It should hold that power easy im running over 700WHP @ 40psi with a 2900PP with a sprung street disc and its still holding but it does shift worse above 8200 RPM I rev it to 9k

 

[EZ_Scootr]

Any words on your experience with the solid street disk?

 

[quayzar590awd]

if your talking about an unsprung disk.... chatter tastic I call them the poor mans dentist. if you are talking about a sprung solid as in no pucks but a regular type they are good. The pedal can be felt but in a good way you wont have a 90 pound left leg. my 2100 and 2600 worked very very well. good for street use. 2600 gets a little suck in traffic but it is still a good clutch.

 

[AndrewD5418]

if your talking about an unsprung disk.... chatter tastic I call them the poor mans dentist. if you are talking about a sprung solid as in no pucks but a regular type they are good. The pedal can be felt but in a good way you wont have a 90 pound left leg. my 2100 and 2600 worked very very well. good for street use. 2600 gets a little suck in traffic but it is still a good clutch.

Yea... Umm... He's wondering how the UNSPRUNG street disc is. Not the sprung. I've had an ACT disc spring set pop out on me and I hated sprung ever since.

 

[quayzar590awd]

for street use GOOD LUCK, I hated it to darn harsh foy my taste. You may like chatter so its all depends on what kind of driving your going to be doing really. If your going to beat the dog piss out of it get an unsprung. If you like the compromise of MAX holding power vs daily drive ability go with the sprung.

 

[hostile]

THE UNSPRUNG STREET DISC has almost no chatter. What are you talking about?

 

[quayzar590awd]

chatter was not the right word your right. I did not like the harsh engagement. you are right i just confused the word. hmm, What is the word i am looking for to describe the noises my mounts and tranny made umm crap i dont know. It made my tranny and everything make noise when I even tryed to slip it the slightest amount because it just locks. I call it chatter idk

 

[donniekak]

I live in a major metro area and deal with lots of traffic. I like an act 2600pp and unsprung puck clutch. I've never had any problems with driving it in traffic. Maybe you have to know how to drive. A couple years ago i had a spec sprung hub clutch in a stealth tt, it spit out the springs. The clutch i replaved it with popped out the springs. Ever since i have used solid hub clutches. Another reason i don't like street disk's is that if you slip them to much on a launch they are useless for at least the rest of the night at the track.

 

[EZ_Scootr]

It's been a long time with no response. Any feedback for those of us that are considering the solid street disk?
If you have anything negative or positive, please let us know. Noisy? Smooth? Shifting at over 7K?

 

[Cesar]

if you make enough power to break the springs off, then it's not really a street car.
If you drive agressivelly, ie launching...then you are probably on an enclosed course. or should be.
the solid disk should be lighter, allowing the synchro assemblies to act faster, but it is no remedy for a worn gearbox.

 

[rock1t]

My personal experience.

I had a ACT 2900 6 spuck unsprung disc. I hated it.

So I went with SPEC stage 3+. I love this one to death.

The unsprung, I could not keep from breaking members of my drivetrain at the track.

 

[red1993gsallmt]

who sells them, i looked up part #3000310 on act's website and its a sprung streetdisk. i have a bad problem with gear lockout

 

[donniekak]

I have an unsprung act disk in my garage, the splines are ripped off of the center. This happened on a car with stock power levels.

 

[red1993gsallmt]

what did your input shaft look like before you installed it. what would cause that to happen?